An ichthyosaur fossil of the Jurassic period, Dinosaurland Fossil Museum, Lyme Regis, Dorset, England (© Christopher Jones/Alamy)(Bing United States)

An ichthyosaur fossil of the Jurassic period, Dinosaurland Fossil Museum, Lyme Regis, Dorset, England (© Christopher Jones/Alamy)(Bing United States)

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